US3946091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic co-polyester articles showing reduced crazing
Assignee: Unitika Ltd
•
Filing: 1974-11-15
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Granted: 1976-03-23
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Expires: 1994-11-15
Abstract
Abstract A blend of an aromatic co-polyester and poly(etylene terephthalate) provides molded articles of reduced crazing.
Inventors
- 👤 Hiroshi Sakata
- 👤 Takashi Okamoto
- 👤 Hirozo Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:46
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/79; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; C08L; C08L67/00; C08L67/02; C08L67/03
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
146 words
A composition showing reduced crazing comprising an aromatic co-polyester and poly(ethylene terephthalate), a. the aromatic co-polyester being a resinous product represented by the formula: ##SPC4## wherein R 1 , R 2 , R 3 , R 4 , R' 1 , R' 2 , R' 3 and R' 4 , which may be the same or different, are members selected from the group consisting of hydrogen, chlorine, and bromine, and n is a positive integer which provides a resinous product; b. the poly(ethylene terephthalate) being present in an amount of from 0.1 to 4 weight % based on the sum of the weight of said aromatic co-polyester and the poly (ethylene terephthalate); and c. the moiety ##SPC5## in the above formula being terephthalic acid units and isophthalic acid units, which are present in said aromatic co-polyester at a molar ratio of about 9:1 to 1:9, respectively.
Claim 2
Dependent Claim
146 words
A composition showing reduced crazing comprising an aromatic co-polyester and poly(ethylene terephthalate), a. the aromatic co-polyester being a resinous product represented by the formula: ##SPC4## wherein R 1 , R 2 , R 3 , R 4 , R' 1 , R' 2 , R' 3 and R' 4 , which may be the same or different, are members selected from the group consisting of hydrogen, chlorine, and bromine, and n is a positive integer which provides a resinous product; b. the poly(ethylene terephthalate) being present in an amount of from 0.1 to 4 weight % based on the sum of the weight of said aromatic co-polyester and the poly (ethylene terephthalate); and c. the moiety ##SPC5## in the above formula being terephthalic acid units and isophthalic acid units, which are present in said aromatic co-polyester at a molar ratio of about 9:1 to 1:9, respectively.
Claim 3
Dependent Claim
25 words
The composition as claimed in claim 1, wherein the molar ratio of the terephthalic acid units to the isophthalic acid units is 7:3 to 3:7.
Claim 4
Dependent Claim
23 words
The composition as claimed in claim 1, wherein the ratio of the terephthalic acid units to the isophthalic acid units is substantially 1:1.
Claim 5
Dependent Claim
22 words
The composition as claimed in claim 1, wherein the logarithmic viscosity (ηinh) of said aromatic co-polyester ranges from about 0.3 to 1.0.
Claim 6
Dependent Claim
22 words
The composition as claimed in claim 4, wherein the intrinsic viscosity [η] of said poly(ethylene terephthalate) ranges from about 0.3 to 1.3.
Claim 7
Dependent Claim
51 words
The compositions as claimed in claim 1, wherein the ratio of the terephthalic acid units to the isophthalic acid units is substantially 1:1, said aromatic co-polyester has a logarithmic viscosity (ηinh) of from 0.4 to 0.8 and said poly(ethylene terephthalate) has an intrinsic viscosity [η] of from about 0.3 to 1.3.
Claim 8
Dependent Claim
101 words
The composition showing reduced crazing comprising an aromatic co-polyester and poly(ethylene terephthalate), a. the aromatic copolyester being a resinous product represented by the formula: ##SPC6## wherein n is a positive integer which provides a resinous product; b. the poly(ethylene terephthalate) being present in an amount of from 0.1 to 4 weight % based on the sum of the weight of said aromatic co-polyester and the poly(ethylene terephthalate); and c. the moiety ##SPC7## in the above formula being terephthalic acid units and isophthalic acid units, which are present in said aromatic co-polyester at a molar ratio of about 9:1 to 1:9, respectively.
Claim 9
Dependent Claim
101 words
The composition showing reduced crazing comprising an aromatic co-polyester and poly(ethylene terephthalate), a. the aromatic copolyester being a resinous product represented by the formula: ##SPC6## wherein n is a positive integer which provides a resinous product; b. the poly(ethylene terephthalate) being present in an amount of from 0.1 to 4 weight % based on the sum of the weight of said aromatic co-polyester and the poly(ethylene terephthalate); and c. the moiety ##SPC7## in the above formula being terephthalic acid units and isophthalic acid units, which are present in said aromatic co-polyester at a molar ratio of about 9:1 to 1:9, respectively.
Claim 10
Dependent Claim
22 words
The composition as claimed in claim 7, wherein the ratio of terephthalic acid units to the isophthalic acid units is substantially 1:1.
Claim 11
Dependent Claim
22 words
The composition as claimed in claim 7, wherein said aromatic co-polyester has a logarithmic viscosity (ηinh) of from about 0.3 to 1.0.
Claim 12
Dependent Claim
37 words
The composition as claimed in claim 7, wherein said aromatic co-polyester has a logarithmic viscosity (ηinh) of from about 0.3 to 1.0 and said poly(ethylene terephthalate) has an intrinsic viscosity [η] of from about 0.3 to 1.3.
Claim 13
Dependent Claim
21 words
The composition as claimed in claim 8, wherein said aromatic co-polyester has a logarithmic viscosity (ηinh) of from 0.4 to 0.8.
Claim 14
Dependent Claim
21 words
The composition as claimed in claim 11, wherein said poly (ethylene terephthalate) has an intrinsic viscosity of from 0.5 to 1.1.
Claim 15
Dependent Claim
10 words
A molded article produced from the composition of claim 1.
Claim 16
Independent Claim
107 words
A method for reducing crazing of a molded article of an aromatic co-polyester comprising a resinous product represented by the formula: ##SPC8## wherein R 1 , R 2 , R 3 , R 4 , R' 1 , R' 2 , R' 3 and R' 4 , which may be the same or different, are members selected from the group consisting of hydrogen, chlorine, and bromine, and n is a positive integer which provides a resinous product; comprising blending from 0.1 to 4 weight % of poly(ethylene terephthalate) therewith, based on the sum of the weight of said aromatic co-polyester and said poly(ethylene terephthalate), prior to molding.
Claim 17
Independent Claim
107 words
A method for reducing crazing of a molded article of an aromatic co-polyester comprising a resinous product represented by the formula: ##SPC8## wherein R 1 , R 2 , R 3 , R 4 , R' 1 , R' 2 , R' 3 and R' 4 , which may be the same or different, are members selected from the group consisting of hydrogen, chlorine, and bromine, and n is a positive integer which provides a resinous product; comprising blending from 0.1 to 4 weight % of poly(ethylene terephthalate) therewith, based on the sum of the weight of said aromatic co-polyester and said poly(ethylene terephthalate), prior to molding.
References Cited (Backward Citations)
GB1392883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |